Optical and electric control of charge and spin-valley transport in ferromagnetic silicene junction

We theoretically investigate the charge and spin-valley transport in a normal/ferromagnetic/normal silicene junction, where the ferromagnetic region is exposed to an off resonant circularly polarized light and perpendicular electric field. We show that one wider transport gap can be produced by the optical field than the electric field, which provides a simple way to fabricate an optical controlled on/off switch. On the other hand, in the presence of a proper optical field and ferromagnetic exchange field, the spin polarized conductance is enhanced above 90%, and the polarized direction can be inverted just by reversing the polarization of the light. Additionally, the valley-polarized conductance is sensitive to the optical and electric field, under proper values, one near perfect K(W) valley-polarized conductance exceeding 95% is realized. All these findings are well understood from the band structure of silicene and expected to be beneficial for real applications in high performance spintronics and valleytronics. (C) 2017 Elsevier Ltd. All rights reserved.